Safety-stirrup.



w. VON SOKOLOWSKI. SAFETY STIRRUP.

APPLICATION FILED DEO.11, 1911.

I 1,058,480, v Patented Apr. 8, 1913.

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UNITED STATES PATENT OFFICE.

WITOLD VON SOKOLOWSKI, OF WARSAW, RUSSIA, ASSIGNOR 0F ONE-HALF TOWALDEMAR VON RtjlVIER, OF CHARLOTTENBURG, GERMANY.

SAFETY-STIRRUP.

Specification of Letters Patent.

Application filed December 11, 191.1.

T 0 all whom it may concern.

Be it known that I, WITOLD VON SOK0- LOWSKI, a subject of the Czar ofRussla, residing at Warsaw, Russia, have invented new and usefulImprovements in Safety- Stirrups, of which the following is a spec1-fication.

The present invention relates to improvements in safety stirrups withhinged treads arranged to open downwardly.

The tread of the safety stirrup accordlng to the present inventionconsists of two members supporting each other, namely a supportingbroadplate and a tread locking the latter. The broadplate has along1tud1- nal slot and is displaceable at one end in a hinge, while theother end bears with two beveled notches on corresponding notches in thefree how of the stirrup. The tread is in the form of a strip adapted tofit in the longitudinal slot in the broadplate and is pivoted on a hingepin of the broadplate. The tread has a beveled nose which will, underthe pressure of a load from above, bear on the broadplate and therebysecure the tread between the bows of the stirrup.

Figure 1 is a front elevation of the closed stirrup, the lower partsbeing shown in section. Fig. 2 is a cross section through the verticalaxis of the stirrup. Fig 3 is a front view of the lower parts of thestirrup, partly in section. Fig. 4 shows the left stirrup bow seen frominside. Fig. 5 is a top view of the broadplate. Fig. 6 is a top view ofthe tread.

While the bows 1, 2 of the stirrup are formed integral, the movabletread consists of two members, namely the broadplate 3 and the treadproper 4. The broadplate 3 has a trapezoidal section, Fig. 2, and has acentral longitudinal slot 16 terminating in a beveled ledge 18, Fig. 5;its one end is bifurcated and has two oval eyes 5, 6 which bear on a pin7 fitted in the foot of the one stirrup bow 2, having a swiveled andslidable fit on said pin 7. The other end of the broadplate bears withits beveled notches 8, 9 on corresponding notches 10, 11 of the how 1and terminates in the slide 12 which will, sliding under action ofspring 13 on the bevels 14, 15 of the bow 1, introduce the bevelednotches 8, 9 of the broadplate 3 into the corresponding notches 1O, 11in the how 1. The tread 4 has the form of a strip which is pivoted atone end on the pin 7.

This strip 4 bears with its beveled ledge 17, on the ledge 18, in theslot 16, projects at 19 above the broadplate 3 and has a shank 20 whichengages in the slot 21, Fig. 4, of the stirrup how 1, and terminates ina head 22 bearing against the outside of the same.

The operation is as follows: When the load acts from above only againstthe top 19 of the strip 4, projecting upward, as will be the case whenthe foot of the rider presses in a vertical downward direction 70, or inan angular direction p not exceeding a given angle, Fig. 2, the beveledledge 17 will bear against the ledge 18 and will force the bevelednotches 8, 9 against the corresponding notches 10, 11 in the stirrupbow, thereby locking the stirrup in service position, as the strip 4will by means of its head 22 hold the bows 1,2 together and prevent themfrom spreading. If the load acts on the broadplate 3 only, as will bethe case when the foot has been caught in the stirrup and acts in anoutward levering direction 7 Fig. 2 the notches 8, 9 will glide down thenotches 10, 11, the bifurcations of the broadplate will be displacedwith their slots on the pin 7, the beveled ledge 18 will be disengagedfrom the ledge 17, of the strip 4 which latter is free of all load, andthe stirrup will open, the foot which has been caught will be released,while the two members of the tread, 3 and 4 will swing around the pin 7downward into the position shown by the dotted lines in Fig. l. A spring13 is provided for automatically closing the stirrup after it hasopened, said spring 13 being attached to the pin 7, and hearing frombelow against the broadplate 3. Under the action of this spring thebroadplate 3 will approach the point of the bow 24 with the points 25and 26 of the beveled notches 8, 9 and will move along the beveledsurface of the bow and rise until the slide 12 reaches the bevels 14,15. The slide 12 then glides along these bevels 14, 15 and projects thebeveled notches 8, 9 into the corresponding notches 10, 11, whereuponthe tread 4, which had been carried during this upward movement by thebroadplate 3, bearing with its top against the transverse wall 23 of thestirrup bow, Figs. 3, 4, will move with its beveled ledge 17 close up tothe ledge 18, whereby the stirrup is again closed and the two bows 1, 2are coupled by means of the head 22.

In the accompanying, hereinbefore referred to drawing a stirrup with asymmetric tread is exemplified, which must be used either on the rightor on the left side of the saddle. The side of this broadplate intendedto be turned forward may, how ever, also be covered by the tread, whenseparate right and left stirrups are provided.

I claim:

1. A safety stirrup with a hinged tread opening in a downward direction,the said. tread composed of two members, a broadplate and a tread properadapted to mutually support each other, the broadplate beingdisplaceable on its hinge and engaging in beveled notches in the stirrupbow opposite to the one having the hinge, the tread pivoted on the hingepin of the broad plate, fitting in a longitudinal central slot in saidbroadplate, and having a beveled ledge engaging in said broadplate andadapted to prevent the latter from disengaging from the said bevelednotches in the stirrup bow, while the tread is under the action of theriders foot in riding position.

2. A safety stirrup with a hinged tread adapted to prevent the latterfrom disengaging from the said beveled notches in the stirrup bow, whilethe tread is under the action of the riders foot in riding position, thefree end of said broa'dplate having the form of a slide under action ofa spring adapted to force the said broadplate with beveled notchesprovided in it into the said beveled notches in the stirrup bow.

In testimony whereof I aflix my signature in presence of two witnesses.

VVITOLD VON SOKOLOWSKI.

Vitnesses ALFRED HEYMS, FRANCIS TREMBICKE.

Copies of thisp'atent maybe obta'ined for five cents each, by addressingthe Commissioner of Patents. Washington, I). C.

